To eliminate this effect, you can place a small piece of opaque material or black foam just long enough to block the direct part of the light from hitting your subject.

为了消除这种效果，可以在闪光灯灯头上加一片不透明材料或黑色塑料泡沫板做的遮光片，以阻挡扩散的光线照射到被摄体。

youdao

Because only a small fraction of light reflects off the coating, the human eye and sensitive detectors see the material as black.

因为只有极小部分的光线能够反射出涂层，因此肉眼和灵敏的探测仪所观察到的这种材料依旧是黑色的。

youdao

The traditional ballast starting, added high-pressure filament material suddenly without preheating, will take serious sputter and loss, and make the light turn black and scrap ahead of time.

传统的镇流器启动，未经预热突加高压灯丝材料会发生严重溅射损耗，导致灯管提前发黑报废。

youdao

When this sort of star implodes, to create a black hole, it generates jets of material that punch their way out of the collapsing mass at near light-speed, to produce extremely high-energy emissions of light.

BBC: Telescope spies cataclysmic blast